In Terms of theme, there are 2 main changes in Mage 2. Removal of skin folder from root. Introduction of a new directory ‘view’ in the module folder structure which actually completes the MVC structure in more structured way. we

Full page caching is now a part of both Community and Enterprise editions of Magento. This means that Magento will cache category and product pages, as well as CMS pages. The cached version of all pages are located in /var/page_cache

Changes in folder structure: Media folder, errors folder, get.php, cron.php and index.php files are all moved to a pub folder. Skin and js folders are also moved to a pub/static folder. This makes it easier to manage static content with